Right at the Paleocene-Eocene boundary a dramatic shift ... At this point one might expect a simple morality tale: Acidified ocean wipes out myriad life-forms, dissolving the shells of corals ...

But from about 50 million years to 35 million years ago, during a period of intense global warming called the Paleocene-Eocene Thermal ... deep open ocean,” says Brownstein. “However, we can say that ...